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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2014-06-04 16:05:35 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-06-30 20:13:54 -0700
commitc3dc58b993c5bd5ef1b60b116d2716e3f8e90207 (patch)
treeea6b9dca2f3c16c55be327d2a4e087741074dc75 /mm
parent99a9ff3961e3b4f33e391e09772a456330e7e109 (diff)
downloadlwn-c3dc58b993c5bd5ef1b60b116d2716e3f8e90207.tar.gz
lwn-c3dc58b993c5bd5ef1b60b116d2716e3f8e90207.zip
hugetlb: restrict hugepage_migration_support() to x86_64
commit c177c81e09e517bbf75b67762cdab1b83aba6976 upstream. Currently hugepage migration is available for all archs which support pmd-level hugepage, but testing is done only for x86_64 and there're bugs for other archs. So to avoid breaking such archs, this patch limits the availability strictly to x86_64 until developers of other archs get interested in enabling this feature. Simply disabling hugepage migration on non-x86_64 archs is not enough to fix the reported problem where sys_move_pages() hits the BUG_ON() in follow_page(FOLL_GET), so let's fix this by checking if hugepage migration is supported in vma_migratable(). Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Reported-by: Michael Ellerman <mpe@ellerman.id.au> Tested-by: Michael Ellerman <mpe@ellerman.id.au> Acked-by: Hugh Dickins <hughd@google.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/Kconfig b/mm/Kconfig
index 1b5a95f0fa01..2f42b9c2f345 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -264,6 +264,9 @@ config MIGRATION
pages as migration can relocate pages to satisfy a huge page
allocation instead of reclaiming.
+config ARCH_ENABLE_HUGEPAGE_MIGRATION
+ boolean
+
config PHYS_ADDR_T_64BIT
def_bool 64BIT || ARCH_PHYS_ADDR_T_64BIT